Acid-alkali in situ preparation method of lead-free rare earth/ rubber composite shielding material

A composite shielding, in-situ preparation technology, applied in radiation safety devices and other directions, can solve the problems of time-consuming synthesis process, reduced X-ray anti-efficiency, and high lead density.

Inactive Publication Date: 2012-03-14
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of protective material has a certain protective effect, it has fatal shortcomings: firstly, due to the high lead content and the high density of lead itself, it is easy to fall from the rubber, and its toxicity will endanger the health of medical staff and patients
Second, lead-containing rubber has a relatively short service life, will age rapidly, and many cracks will appear, resulting in a significant reduction in the effect of preventing X-rays
However, there are problems in this method: unsaturated rare earth organic complexes, as a directly added crystal substance, need to be washed and recrystallized many times before compounding, the synthesis process is time-consuming and causes a lot of waste of solvents; the inorganic rare earth in the system Oxides and unsaturated rare earth organic complexes remaining after the reaction are dispersed in micron scale, which is easy to cause stress concentration and reduce its mechanical properties

Method used

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  • Acid-alkali in situ preparation method of lead-free rare earth/ rubber composite shielding material
  • Acid-alkali in situ preparation method of lead-free rare earth/ rubber composite shielding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition and weight fraction of each component are:

[0026] Nitrile rubber 100

[0027] Samarium Hydroxide 30

[0028] Methacrylic acid 40

[0029] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane 3

[0030] At room temperature, put 100 parts of nitrile rubber on the open mill to masticate thin pass for 2 minutes, then add 30 parts of samarium hydroxide to the roller, and mix for 3 minutes; turn on the cooling water switch, and maintain the temperature of the roller at 60°C. Start to add 40 parts of methacrylic acid dropwise and mix for 6 minutes; finally add 3 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, make 6 triangular bags, After the rollers were parked for 24 hours, they were vulcanized and molded on a flat plate at 170°C to obtain a composite material.

Embodiment 2

[0032] The composition and weight fraction of each component are:

[0033] Nitrile rubber 100

[0034] Samarium Hydroxide 130

[0035] Gadolinium Hydroxide 130

[0036] Methacrylic acid 340

[0037] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hexane 5

[0038] At normal temperature, put 100 parts of nitrile rubber on the open mill to masticate the thin pass for 2 minutes, then add 130 parts of samarium hydroxide and 130 parts of gadolinium hydroxide to the roller successively, and knead for 15 minutes; Turn on the switch, and when the roller temperature is maintained at 80°C, start to add 340 parts of methacrylic acid dropwise and mix for 20 minutes; finally add 5 parts of 2,5-dimethyl-2,5-bis(tert-butyl peroxy ) hexane, bagged 8 times, and after the lower roll was parked for 24 hours, it was vulcanized and molded on a flat plate at 170°C to obtain a composite material.

Embodiment 3

[0040]The composition and weight fraction of each component are:

[0041] Nitrile rubber 100

[0042] Samarium Hydroxide 90

[0043] Gadolinium Hydroxide 100

[0044] Dysprosium hydroxide 90

[0045] Methacrylic acid 380

[0046] Dicumyl peroxide 6

[0047] At normal temperature, put 100 parts of nitrile rubber on the open mill to masticate the thin pass for 2 minutes, then add 90 parts of samarium hydroxide, 100 parts of gadolinium hydroxide and 90 parts of dysprosium hydroxide to the roller successively, and knead 15 minutes; turn on the cooling water switch, wait until the roller temperature is maintained at 80°C, start to add 380 parts of methacrylic acid dropwise, and mix for 20 minutes; finally add 6 parts of dicumyl peroxide, make 8 triangle bags, After the rollers were parked for 24 hours, they were vulcanized and molded on a flat plate at 160°C to obtain a composite material.

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Abstract

The invention relates to an acid-alkali in situ preparation method of a lead-free rare earth / rubber composite shielding material. The preparation method comprises the steps of: dynamically generating an unsaturated rare earth organic coordination compound by an acid-base reaction, and compounding the unsaturated rare earth organic coordination compound with a rubber matrix by using an in situ dispersing technology to realize the nanometer level dispersion of the rare earth dispersed phase with an X ray shielding function in the matrix. The method avoids the trouble of singly synthesizing the unsaturated rare earth organic coordination compound in a direct method, the dispersibility of the lead-free rare earth / rubber composite shielding material is better, and the X ray shielding property and the general physical and mechanical properties of the prepared lead-free rare earth / rubber composite shielding material are better than those of the composite material obtained by mixing the unsaturated rare earth organic coordination compound with the rubber by the direct method. The lead-free rare earth / rubber composite shielding material is extensively applied to protecting the workers of diagnosis X ray machines, X ray diffractometers, emitters of electron microscopes and other occasions with X ray generation.

Description

Technical field: [0001] The invention relates to an acid-base in-situ preparation method of a lead-free rare earth / rubber composite shielding material, which is applied to the field of medical X-ray protection. Background technique: [0002] X-ray impact technology is playing an increasingly important role in modern medicine. On the one hand, the use of X-rays brings great benefits to medical diagnosis and treatment, and at the same time brings great harm to the health of irradiated medical workers and patients. Damage is coming, so protection must be strengthened. [0003] Anti-X-ray rubber composite materials can be used to make protective equipment for medical X-ray laboratory personnel and patients, and can be used to manufacture protective devices for medical X-ray technical equipment. The traditional anti-X-ray rubber is to add metal lead and lead compounds with certain dispersion to the rubber matrix. Although this type of protective material has a certain protectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/02C08F255/06C08L51/04C08L51/06A61B6/10
Inventor 刘力周瑶张立群胡水温世鹏冯予星
Owner BEIJING UNIV OF CHEM TECH
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